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[" 4.Using tho formula,cos "A=sqrt((1+co...

[" 4.Using tho formula,cos "A=sqrt((1+cos2A)/(2))],[" find the value of "cos30^(@)" .it being "],[" givan thre "60560^(@)=(1)/(2)" ."]

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Using the formula, sinA=sqrt((1-cos2A)/(2)) , find the value of sin30^(@) , it being given that cos60^(@)=(1)/(2) .

Using the formula cos A =sqrt((1+cos2A)/(2)) , find the value of cos30^(@) , it is given that cos60^(@)=(1)/(2) .

Using the formula cos A =sqrt((1+cos2A)/(2)) , find the value of cos30^(@) , it is given that cos60^(@)=(1)/(2) .

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